using System.Collections.Concurrent;
using Managing.Application.Abstractions.Services;
using Managing.Application.Hubs;
using Managing.Domain.Backtests;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using static Managing.Common.Enums;

namespace Managing.Application.Workers;

public class NotifyBundleBacktestWorker : BaseWorker<NotifyBundleBacktestWorker>
{
    private readonly IServiceProvider _serviceProvider;
    private readonly IHubContext<BacktestHub> _hubContext;
    private readonly ConcurrentDictionary<Guid, HashSet<string>> _sentBacktestIds = new();

    public NotifyBundleBacktestWorker(
        IServiceProvider serviceProvider,
        IHubContext<BacktestHub> hubContext,
        ILogger<NotifyBundleBacktestWorker> logger)
        : base(WorkerType.NotifyBundleBacktest, logger, TimeSpan.FromMinutes(1), serviceProvider)
    {
        _serviceProvider = serviceProvider;
        _hubContext = hubContext;
    }

    protected override async Task Run(CancellationToken stoppingToken)
    {
        try
        {
            // Create a new service scope to get fresh instances of services with scoped DbContext
            using var scope = _serviceProvider.CreateScope();
            var backtester = scope.ServiceProvider.GetRequiredService<IBacktester>();

            // Fetch all running bundle requests
            var runningBundles = await backtester.GetBundleBacktestRequestsByStatusAsync(BundleBacktestRequestStatus.Running);

            foreach (var bundle in runningBundles)
            {
                var requestId = bundle.RequestId;

                // Fetch all backtests for this bundle
                var (backtests, _) = backtester.GetBacktestsByRequestIdPaginated(requestId, 1, 100);
                if (!_sentBacktestIds.ContainsKey(requestId))
                    _sentBacktestIds[requestId] = new HashSet<string>();

                foreach (var backtest in backtests)
                {
                    if (_sentBacktestIds[requestId].Contains(backtest.Id)) continue;

                    // If backtest is already LightBacktest, send directly
                    var lightResponse = backtest as LightBacktest;
                    if (lightResponse != null)
                    {
                        await _hubContext.Clients.Group($"bundle-{requestId}")
                            .SendAsync("BundleBacktestUpdate", lightResponse, stoppingToken);
                        _sentBacktestIds[requestId].Add(backtest.Id);
                    }
                }

                // If the bundle is now completed, flush the sent IDs for this requestId
                if (bundle.Status == BundleBacktestRequestStatus.Completed && _sentBacktestIds.ContainsKey(requestId))
                {
                    _sentBacktestIds.TryRemove(requestId, out _);
                }
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error in NotifyBundleBacktestWorker");
        }
    }
}